Texas Basic Waste Water Operations Ch#12 Disinfection - Statistics

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This quiz has been taken 14 times
The average score is 18 of 32

Answer Stats

Question	Answer	% Correct
Disinfection prevents waterborne disease by protecting public water supplies, water for recreation, and shellfish growing areas.	True	100%
Disinfection destroys disease-causing microorganisms called pathogens	True	100%
Waterborne diseases include typhoid, hepatitis A, cholera, dysentery, poliomyelitis, and measles.	False	83%
Two methods often used to disinfect wastewater effluent are chlorination and ultra-purple radiation.	False	83%
Chlorine leaks are detected with ________% ammonium hydroxide vapor.	10	67%
Effluent chlorine dosage must provide a total combined residual of at least ________ mg/L for at least ________ minutes at peak flow.	1.0/20	67%
Because HOCl is a ________, it is more effective at low pH.	acid	67%
Strong concentrations of chlorine can cause ________.	all of the above	67%
In addition to disinfection, chlorine is used to ________.	all of the above	67%
The TCEQ allows the reuse of treated wastewater for ________.	all of the above	67%
Milk, coffee, or ________ candy relieves throat irritation.	peppermint	67%
Factors influencing disinfection are pH, temperature, contact time, chlorine concentration, and ________.	residual type	67%
Gas chlorinator feed rates are indicated by the ________ in pounds per day.	rotameter	67%
Dosage is the amount of chlorine applied; demand is the amount of chlorine used up; and residual is the amount of chlorine left after demand.	True	67%
When chlorine and water mix, hypochlorous (HOCl) and hydrochloric (HCl) acid are formed.	True	67%
Chloramines are the combined residual.	True	67%
Reclaimed water providers must report monthly to the TCEQ the ________ and ________ of reclaimed water delivered to a user.	volume/quality	67%
In case of exposure to chlorine, ________.	all of the above	50%
Operators must use ________ as a chlorine indicator in the titrimetric or spectrophotometric residual test methods.	DPD	50%
Calcium hypochlorite, known as HTH, contains 35% chlorine and 65% lime.	False	50%
The higher the water temperature, the ________ the disinfection rate.	faster	50%
The ________ the dosage, the ________ the contact time required.	higher/shorter	50%
The addition of water to a chlorine leak ________.	makes the leak worse	50%
To protect aquatic organisms from ________ such as chlorine, the TCEQ requires dechlorination in some discharge permits.	toxins	50%
Gas chlorinators use ________ to draw chlorine into a water stream.	vacuum	50%
Chlorine container valve wrenches must be no longer than ________ inches.	8	33%
Chlorine gas is greenish-yellow in color, 2½ times heavier than water, and has a strong pungent odor.	False	33%
Chlorine does not burn, but is a strong oxidizer and reacts violently with oil and other hydrocarbons.	True	33%
When chlorine reacts with lime, chloramines form.	False	17%
The ________ residual is more powerful and faster acting than the ________ residual.	free/combined	17%
Hypochlorous acid (HOCl), a powerful disinfectant, is the combined residual.	False	0%
Dechlorination may be achieved by long detention time, aeration, sunlight, activated carbon, or ________.	filtering	0%

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